Critical Apache Flink Vulnerability Enables Remote code execution Attacks

HomeCyber Security News Critical Apache Flink Vulnerability Enables Remote code execution Attacks By Abinaya May 19, 2026 A newly disclosed critical vulnerability in Apache Flink, tracked as CVE-2026-35194, exposes distributed data processing environments to remote code execution (RCE) attacks via SQL injection flaws in the platform’s code generation engine. The flaw lies in Apache Flink’s SQL code-generation mechanism, where user-supplied input is improperly sanitized before being embedded in dynamically generated Java code. This allows authenticated users with query submission privileges to inject malicious payloads that escape intended string boundaries and execute arbitrary code. Specifically, the vulnerability affects: JSON functions were introduced in Flink version 1.15.0. LIKE expressions with ESCAPE clauses were introduced in version 1.17.0. By exploiting these components, attackers can craft SQL queries that manipulate the code generation process, ultimately achieving arbitrary code execution on TaskManager nodes within a Flink cluster. According to the advisory, the following versions are vulnerable: Apache Flink 1.15.0 through 1.20.x (before 1.20.4). Apache Flink 2.0.0 through 2.x (before 2.0.2, 2.1.2, and 2.2.1). Apache contributor Martijn Visser publicly disclosed the issue on May 15, 2026, and rated it critical due to its impact on production clusters. Apache Flink Vulnerability The root cause lies in unsafe string interpolation during SQL-to-Java code translation. User-controlled input is directly inserted into generated code without proper escaping or validation. This allows attackers to: Break out of string literals in generated Java code. Inject arbitrary Java expressions or method calls. Execute malicious code across distributed TaskManager nodes. Given Flink’s architecture, successful exploitation can lead to full cluster compromise, data manipulation, or lateral movement within the environment. The vulnerability is particularly dangerous in multi-tenant or shared environments where users have query execution permissions. Even without administrative privileges, an attacker can escalate their capabilities and gain control over backend processing nodes. Apache has released patched versions to address the issue and urges users to upgrade immediately to versions 1.20.4, 2.0.2, 2.1.2, or 2.2.1. Additional mitigation steps include: Restricting query submission privileges to trusted users. Monitoring SQL query activity for anomalous patterns. Implementing runtime security controls on TaskManager nodes. Organizations using Apache Flink in production environments should prioritize patching, as exploitation could result in severe operational and data security risks. Follow us on Google News, LinkedIn, and X to Get More Instant Updates. Tags cyber security cyber security news Copy URL Linkedin Twitter ReddIt Telegram Abinayahttps://cybersecuritynews.com/ Abi is a Security Editor and fellow reporter with Cyber Security News. She is covering various cyber security incidents happening in the Cyber Space. Trending News Google Enhances Android Mobile Security with New AI-Powered Protections No Blind Spots: How Top MSSPs Prevent Incidents with Live Threat Visibility TeamPCP and BreachForums Hackers Running $1,000 Contest for Supply Chain Attacks Amazon Quick Bug Exposed AI Chat Agents to Users Blocked by Custom Permissions Anthropic’s Mythos AI Reportedly Found macOS Vulnerabilities that Could Bypass Apple Security Latest News Cyber Security News Attackers Use Cloudflare Storage Endpoint to Exfiltrate Files From Compromised Networks Cyber Security News New VoidStealer Malware Bypasses Chrome’s Protection to Steal User Data Cyber Security News Nx Console VS Code Extension Compromised to Steal Developer and Cloud Secrets Cyber Security News Microsoft to Retire Teams Together Mode to Enhance Performance Improvements Cyber Security News Critical Marimo Security Vulnerability Enables Remote Code Execution Attacks